Refactor user authentication and dashboard features

- Added `is_admin` field to User model for role management.
- Updated user context middleware to include current user in templates.
- Enhanced session management with improved debug middleware.
- Refactored dashboard view to fetch user-specific data and recent events.
- Improved login and registration templates for better user experience.
- Added admin routes with access control for admin users.
- Updated Docker configuration for better error logging and dependency management.
- Updated requirements to include new dependencies and specify versions.

app/templates/base.html

@@ -44,7 +44,7 @@
       <!-- Desktop Navigation -->
       <div class="flex justify-between items-center py-4">
         <div class="flex items-center space-x-3">
-          <img src="https://via.placeholder.com/40x40" alt="LeagueLedger Logo" class="h-10 w-10">
+          <img src="https://picsum.photos/40" alt="LeagueLedger Logo" class="h-10 w-10">
           <h1 class="text-2xl font-bold font-garamond">LeagueLedger</h1>
         </div>
         
@@ -62,6 +62,11 @@
           <a href="/dashboard" class="hover:text-golden-ale transition-colors duration-200">
             <i class="fas fa-tachometer-alt"></i> Dashboard
           </a>
+          {% if current_user and current_user.is_admin %}
+          <a href="/admin/" class="hover:text-golden-ale transition-colors duration-200">
+            <i class="fas fa-lock"></i> Admin
+          </a>
+          {% endif %}
           <a href="/about" class="hover:text-golden-ale transition-colors duration-200">
             About
           </a>
@@ -111,6 +116,11 @@
           <a href="/dashboard" class="hover:bg-green-800 py-2 px-3 rounded-md transition-colors duration-200">
             <i class="fas fa-tachometer-alt"></i> Dashboard
           </a>
+          {% if current_user and current_user.is_admin %}
+          <a href="/admin/" class="hover:bg-green-800 py-2 px-3 rounded-md transition-colors duration-200">
+            <i class="fas fa-lock"></i> Admin
+          </a>
+          {% endif %}
           <a href="/about" class="hover:bg-green-800 py-2 px-3 rounded-md transition-colors duration-200">
             About
           </a>